Overseaming sewing-machine.



3 SHEETS-MEEET 1.

Patented Nov. 9, 1909.

E. PRAZAK- OVBRSEAMING SEWING MACHINE.

APPLICATION FILED MAY 29, 1907.

E. PRAZAK. OVERSEAMING SEWING MACHINE. APPLICATION FILED MAY 29, 1907.

Patented Nov. 9, 1909.

s SHEETSJSHEIHT 2.

l/WE/VIOR E. 'PRA'ZAK.

OVERSEAMING. SEWING MACHINE.

ABPLIGATION FILED MAY 29, 1907.

Patented Nov. 9 1909.

3 SHEETS-SHEET 3.

WITNESSES:

TTORNEV UNITED STATES .PAIENT eerie EMIL PRAZAK, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTUR- ING COMPANY, A CORPORATION OF NEW JERSEY.

OVERSEAMING SEWING-MACHIN E.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application filed May 29, 1907. Serial No. 376,291.

T 0 all whom it may concern:

Be it known that I, EMIL PRAZAK, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Overseaming Sewing-Machines, of which the following isa specification, reference being had therein to the accompanying drawings.

This invention relates to certain improvements in fur and glove sewing machines provided with horizontally disposed feedand presser-wheels adapted to support and advance the edge of the work vertically for the action of the horizontally reciprocating needle with coiiperating looper moving over the edge of the work to seize needle-thread loops upon one side and present thread loops upon the opposite side in the production of overseaming stitches.

The invention has for its object to produce a machine of this character in which the operative movements of the several moving parts are positive, while their arrangement and mode of operation are such as to a li'ord a machine which is convenient to operate and capable of running at high speed in practical operation.

The invention consists in the various details of construction to this end herein shown and described.

In the accompanying drawings, Figure 1 is an elevation of the machine with the frame or casing in section adjacent the right-hand wall, or that nearest the presser-wheel bracket. Fig. 1 is a detail of the needleclamp. Fig. 2 a top plan view of the same with the cover removed, and Fig. 3 a sectional plan view of the machine taken in a plane just above the feed-wheel. Fig. 4 is a detail sectional view of the feed-regulator shaft and the connected parts, and Fig. 5 a perspective view of the mechanism for oscil- .lating the looper-bar. Fig. 6 is a detached sectional view of the thread-nipper. Fig. 7 is a rear side elevation of the entire machine, including the treadlc-stand and the head carrying the stitch-forming and feeding devices.

The sewing machine head comprises the usual rectangular casing 1 having the forwardly extending base-portion 2 and provided at the top on the rear side with perforated hinge-lugs 3 to whichare. pivotally secured by means of the pin 4 the hinge-lugs 5 of the cover 6 of the casing. The casing is provided with lateral bearing bosses 7 in which is journaled the transverse main-shaft 8 provided with the balance-wheels 9 and grooved belt-wheels 10.

The longitudinally reciprocating needlebar 11 isv mounted in suitable bearings 12 and carries at its forward end the needleclamp block 13 in which. is clamped by means of the auxiliary clamp-plate, 14 and screw 15 the shank of the thread-carrying needle 16. The needle-bar is provided intermediate its ends with a depending yoke 17 embracing an actuating cam or eccentric 18 upon the main-shaft (as represented only in dotted lines in Fig. 3) for imparting the reciprocating motions to the needle.

The looper-loar 19 is fitted at its rearward end to slide and rock in the oscillating bearing 20 having a depending transversely apertured boss 21 to which is fitted the transverse pivotal rod 22 whose opposite ends are fitted to either set of bearing apertures 23 or 23 in longitudinal arrangement in the lateral bearing bosses 24L upon the inner sidewalls of the casing 1, for the purpose to be hereinafter described. To a portion of the looper-bar in advance of the oscillating bearing 20 is loosely fitted a sleeve 25 embraced by the spaced crank-arms 26 of a transverse roek-shaft 27 mounted in the inwardly extending bearing-bosses 28 of the casing. The sleeve 25 is provided with lateral pins 29 entering bearing apertures in said crankarms 26 and confined therein by means of the caps 30. The sleeve is confined from endwise movement upon the looper-bar 19 by means of a fixed collar 31 near its forward'end and a collar 32 at the rearward end of said sleeve having a ball-cranleann 33.

Upon the forward end of the looper-bar 19 is mounted the looper-carrier comprising the split collar 34 and clamp-screw 35-by which it is adjustably secured to the looperbar, and a longitudinally extending arm 36 having at its forward end a transverse socket 37 in which is clamped in vertical adjustment by means of a fastening-screw 38 the shank of the looper 39, herein represented of the non-thread-carrying type of well-known form with thread-engaging point 40. As will be observed, the looper-carrier is so mounted upon the looper-bar as to be adjustable both longitudinally and laterally thereon, while the looper is similarly mounted in its carrier to receive vertical and circular adjustment therein.

The main-shaft is provided with a looperactuating eccentric 4-1 embraced by the strap 42 at the lower end of the eccentric-rod 43 pivotally connected at its upper end by means of a pin 44 With a lateral crank-arm 45 clamped adjustably upon the rock-shaft 27 by means of the cap 46 and screws 47. The rotation of the main-she. ft with its actuating eccentric 41 thus causes the oscillation of the shaft 27 and the consequent endwise and rising-and-falling movements of the looper-bar, and consequently the circular movement of the looper point around the edge of the work in cooperation with the needle upon opposite faces of the work in the production of overseaming stitches.

The main-shaft S has fixed thereon the cam-disk 48 having in one of its lateral faces the cam-groove 49 entered by a lateral stud 50 mounted upon a crank-arm 51 having a sleeve 52 journaled upon a fixed stud 53 upon the rear side of the casing l. The outer end of the crank-pin 51 is formed with a depending portion 54 carrying a lateral ballcrankpin 55 embraced by one end of a link 56 whose opposite end embraces the spherical end of the crank-arm 33 fixed upon the looper-bar 19. The rotation of the cam-disk 48 operates through the crank-arm 51, link 56 and crank-arm to oscillate the looper-bar 19 for imparting to the looper-hook 40 its sidewise loop-seizing and loop-presenting movements in respect of the needle, in a manner well-known. By the provision of the intermediate crai'ik-arn'i 51, not only is the stud 50 maintained parallel with the main-shaft throughout its operative movements, so that the cam-groove 45) may be made with parallel walls for etlicient operation of such coacting parts, but the crank-pin 55 may be positioned in the lowest possible position without interference with the main-shaft in order to permit of a long link 56 so to insure easy operative angles between the members 56 and 33 to avoid excessive wear and noise in the operation of such parts.

The feeding mechanism comprises the upright shaft 57 provided at its upper end with the fixed feed-wheel 58 having the usual serrated peripheral portion and at its lower end with the feed cam 59 formed upon its upper side with an annular flange (30 embraced by the transversely grooved outer ends of the clutch-dogs 61 whose wedgeshaped inner ends enter corresponding notches in the hub portion of the actuating member or rocker ()2 having lateral arms 63 between each of which and its respective clutch-dog is interposed a spring (34, and having the lateral arms 65 adapted to insure the movement of the clutch-dogs with said rocker after each operative movement upon the feed-cam. To prevent retrograde movement of the feed-wheel, a holding dog 0 is provided, whose notched operative end embraces the flange (30 of the feed-wheel and whose opposite end is maintained in contact relation with the side-wall of the base portion 2 of the casing by means of an interposed spring 67.

The rocker (32 is provided with a lateral arm 68 having the spherical-hemled pin (it) connected by means of a link 70 with a similar pin 71* carried by the depending arm Tl of a rock-lever jonrnalcd upon a transverse fulcruln-rod 72 and having a lateral arm 73 connected by means of a pivotal screw 74 with the lower end of a lever T5 whose upper end is forked to embrace an actuating cam 76 upon the main-shaft and fulcrmned intermediate its ends by means of a stud '77 at the upper end of a link 78 whose opposite end is pivotally connected by means of a pin 79 with the outer end of a crankarm 80 mounted upon the inner end of the feed-regulator shaft 81 mounted in thesplit bushing 82 of the bearing boss and having fixed upon its outer end by means of the set-screw 84 the regulating lever 85; the operating lever 75 being hung and controlled in its resultant vertical movements for actuation of the rock-lever T1 73, substantially as in the United States Patent No. 229,028) dated July (3, 1880, as embodied in the wellknown Singer oscillating shuttle machines. A clamp-screw S6 is applied to the bearing boss 83 for producing a regulated lateral pressure upon the split-bushing 83 for producing a correspondingly regulated frictional resistance upon the feed-regulator shaft 81 to prevent the working of the same out of any given adjustment under the continued operation of the machine. while permitting the same to be readily shifted to different positions of adjustment by means of the operating lever (ooperating with the feed-wheel 58 in supporting and ad vancing the work is the presser-wheel 1'. which is mounted upon a stud fitted to and fixed adjustal'ily within a socket S9 of the presser-wheel bracket 5) by means of a set-screw 91, and provided at its upper end with a head formed with a lateral arm 1):) having a radial needle-guiding groove 5);, in the outer portion of its upper face to receive the needle it). The stud Sb and its lateral needleguiding arm 92 are preferably formed in one piece and therefore in fixed relation. and the stud may be so adjusted and fixed in its socket as to bring the needle-guiding groove 9?, in proper relation with the needle so as to properly guard the latter and insure the proper presentation of its thread-loops for seizure by the looper.

The presser-wheel bracket is of the well-known arched form, with its upright member adjacent the body of the casing 1 offset by means of a lateral arm at its base from a shank 94 entering'and clamped by means of a set-screw 95 within a socket 96 at the forward end of a lever 97 pivoted near its forward end by means of the horizontally disposed center screws 98 within the base of the casing and having its rear ward end extended through the rear wall of said casing and provided with an eye 99 entered by the lower end of a guide-bar 100 whose upper end enters a similar eye or aperture in a stationary bracket 101 upon the rear wall of the casing 1 and provided with a set-screw 102' adapted to engage the bar 100. The guide-bar 100 is provided with a thrust-collar 103 secured adjustably thereon by means of a set-screw 104, and intermediate said thrust-collar and a washer 105 resting upon the eyed end of the lever 97 is interposed a pressure spring 106 acting through the lever 97 and resser-wheel bracket 90 to force the presser-wheel 87 in yielding operative relation with the work interposed between the same and the feedwheel 58. When the set-screw 102 is loosened and the guide-bar 100 is permitted to adjust itself freely within the bracket member 101, the thrust-collar 103 seats itself upon the under side of the latter and the spring 106 acts upon the presser-wheel 87 to a minimum degree to adapt the machine for operation upon the lighter classes of fabric requiring a very slight pressure between the presserand feed-wheels; but by forcing the guide-bar 100 downward to a greater or less degree and thereby similarly forcingthe thrust-collar 103 downwardly to further compress the spring 106, and tightening the set-screw 102 in the required position, the tension of the spring 106 may be adjusted for operation of the machine upon heavier fabrics requiring a greater pressure of the presserand feedwheels upon the work.

The rear wall of the casing is provided with a stud 107 upon which is journaled a grooved pulley-wheel 108, and one end of a chain 109 is secured by a screw-hook 110 to the top of the lever 97 and then around the pulley 108 and thence through a suitable aperture in the platform 111 of the supporting stand, around a grooved idler-pulley 112 supported by a bracket 113 upon the under side of said platform, to a hook 114 at the outer end of a depending arm 115 of a rocking-hub 116 journaled upon a pin 117 carried by a bracket 118-upon the under side of the platform 111 and having a depending lmee-lever 119 carrying a pressure-plate 120 adapted for engagement bythe knee of the operator for actuating the lever 97 to separate the presser-wheel from the feed-wheel in opposition to the action of the spring 106.

By the employment of the chain-and-pulley connection between the knee-lever 119 and the presser-actuating lever 97, the usual supplemental treadle for operating the presserwheel is dispensed with and the use of the usual full sized treadle-plate 121 journaled in the brace 122 between the end standards 123 of the treadle stand is permitted.

The needle-clamp block 13 carries, as is usual in this class of machines, a thread nipping device cotiperating with the other thread-handling members in the formation of stitches, and in the present instance this device comprises a socket 124 set into the block 13 and having an axially arranged threaded pin 125 having a nicked head 126 between which and the adjacent end of the socket 124 the needle-thread passes, the opposite threaded end of said pin being pro vided with a nut 127 between which and the bottom-of the socket is interposed a spring 128 for retaining the head 126 yieldingly clamped upon the needle-thread. Upon a suitable seat formed in the front side of the casing 1 adjacent the needle-bar is secured by means of a screw 129 a rigid arm 130 formed with a longitudinal cam member 131 with outwardly turned forward end and adapted to engage the adjacent end of the thread-nipper pin 125 to relieve the pressure of the head 126 upon the thread when the needle is in retracted position, but adapted to release the same to enable the spring 128 to produce by means of the head 126 a clamping action upon the thread when the needle is in its forward loop-presenting position in order that seizure of the threadloop'by the looper may serve to set the preceding stitch in the act of carrying such loop over the edge of the work for presentation to the needle in its succeeding forward movement. The nut 127 obviously affords a means of varying the tension of the spring 128 and hence the intensity of the nipping action of the head 126 upon the thread. The cap or cover 6 of the casing is provided with the usual bracket 132 carrying the inclined spool-pin 133 with thread-guiding disk 134, the spool pin having mounted thereon the thread-spool 135 from which the thread leads over the rim of the flange 134 to the tension device 136 mounted upon the post 137 of the cover 6, thence through the thread-eye 138 of the cover forwardly and downwardly under the thread-nipper pin 125 to the needle 16.

From the foregoing description, the operation of the machine herein shown and described will be understood, as it involves the same general mode of operation of stitchforming and feeding devices as others of the same general type long in practical use.

While the present machine is similar in general constructive features to others of the same class, I wish it to be understood that all the novel specific features of construction and arrangement of parts shown and described herein are of my invention.

' Having thus set forth the nature of the invention what I claim herein is 1. In an overseaming sewing machine, the combination with the main-shaft, a needle, and means connected with the main-shaft for reciprocating the same, of a looper-bar, a looper carried thereby, an oscillating hearing in which the rearward portion of said looper-bar is fitted to slide and oscillate, a sleeve loosely fitted upon said looper-bar in advance of said bearing and confined from endwise movement thereon, a transverse crank-shaft having crank-arms embracing said loose sleeve, a pivotal connection between said crank-arms and said sleeve, a crank mounted upon and axially adjustable on said crank-shaft, and'an operative connection intermediate the main-shaft and said adjnstably mounted crank.

2. In an overseaming sewing machine, the combination with the main-shaft, a needle, and means connected with the main-shaft for reciprocating the same, of a looper-bar, a looper-carrier comprising a collar fitted upon said looper-bar and adapted for adjustment longitudinally thereof, a looper having a shank secured to said looper-carrier and adjustable thereon transversely of the looper-bar, an oscillating bearing in which the rearward portion of said looperbar is fitted to slide and oscillate, a sleeve loosely titted upon said looper-bar in advance of said bearing and confined from endwise movement thereon, a rocking mem her having an axis of movement transversely of said looper-bar, an operative connection intermediate said loose sleeve and a point of said rocking member eccentric to its axis of motion, and an adjustable operative connection intermediate the main-shaft and said rocking member whereby the movements of. the latter may be varied for different adjustments to correspomlingly vary the operation of the looper.

3. In an overseaming sewing machine, the combination with the main-shaft, a needle, and in *ans connected with the main-shaft for reciprocating the same, of a looper-bar, a looper-carrier comprising a collar titted upon said looper-bar and adapted for adjustment longitudinally thereof, a looper having a shank secured to said looper-carrier and adjustable thereon both axially and transversely of the looper-bar, an oscillating bearing in which the rearward portion of said looper-bar is fitted to slide and oscillate, a sleeve loosely fitted upon said looper-bar in advance of said bearing and. confined from endwise movement thereon, a rocking member having an axis of movement transversely of said looper-bar, an operative connection intermediate said loose sleeve and a point of said rocking member eccentric to its axis of motion, and an adjustable operative connection intermediate the main-shaft and said rocking member whereby the movements of the latter may be varied for ditlerent adjustments to correspondingly vary the operation of the looper.

4-. In an overseaming sewing machine, the combination with the mainshaft, a needle. and means connected with the main-shaft for reciprocating the same, of a looper-bar, a looper carried thereby, an oscillating hearing in which the rearward portion of said looper-bar is fitted to slide and oscillate, a transverse rod upon which said bearin is adapted to oscillate, a plurality of hxed bearings longitudinally disposed in respect of said looper-bar to which said transverse rod is removably fitted for arrangement alternately in different longitudinal positions, a sleeve loosely fitted upon said looperbar in advance of said bearing and confined from endwise movement thereon, a rocking member having an axis of movement transversely of said looper-bar, an operative connection intermediate said loose sleeve and a point of said rocking member eccentric to its axis of motion, and an operative connection intermediate the main-shaft and said rocking member.

5. In an overseaming sewing machine,the combination with a stand provided with a supporting platform, a sewing machine frame mounted thereon, a main-shaft journaled therein, a needle, and means connected with the mainshaft for reciprocating the same, of a looper-bar, a looper carried thereby, connections intermediate said main-sha ft and looper-bar for imparting to the latter reciprocating, rising-aml-falling and oscillating movements to cause the looper to (mill)- e 'ate with the needle in the production of overseaming stitches, a vertical feed-shaft, means connected with the main-shaft for imparting thereto step-by-step rotary move,- ments, a horizontal feed-wheel mounted upon the feed-shaft adjacent the needlepath, a presser-wheel bracket pivotally mounted upon the frame and constructed with an upwardly extending arm and a rearwardly extending arm, a presser-wlwel carried by said upwardly extending arm and adapted to cooperate with the feed-wheel in advancing the work to space the stitches, a spring interposed between a fixed member of the frame and said rearwardly extending arm of the presser-whcel bracket for forcing the same down ardly to yieldingly maintain the presser-wheel in operative relation with the feed-wheel, a pulley-wheel mounted upon the frame, a pulley-wheel mounted beneath the same upon the under side of the supporting platform, a knee-lever also pivotally mounted upon the under side of said platform, and a chain or cord connected with the rearwardly extending arm of the resser-wheel bracket and led upwardly over the first-named pulley and downwardly through the platform and around the second-named pulley and connected with said knee-lever.

(3. In an overseaming sewing machine, the combination with the frame, a main-shaft journaled therein, a horizontally reciprocating needle, a cooperating looper, means connected with said main-shaft for reciprocating the needle, and means connected with the main-shaft for imparting to said looper reciprocating, rising-and-falling and oscillating movements in the production of overseaming stitches, of feeding mechanism comprising a vertical feed-shaft, a feed-wheel mounted thereon adjacent the needle-path, a clutch-wheel mounted upon said feedshaft, a feedcam mounted upon the mainshaft, clutchactuating mechanism intermediate the same and said clutch -pulley and comprising a vibrating lever forked to embrace said feed-cam, a feed-regulator shaft passing through the wall of said frame and having at its outer end an operating lever and its inner end a crank-arm, a link connecting said crank-arm with said vibrating lever intermediate the ends of the latter and affording a fulcrum therefor, and a friction device applied to said feed-regulator shaft to prevent its shifting under the action of the machine.

In testimony whereof, I have signed my name to this specification, in the presence of 'two subscribing witnesses.

ElWIL PRAZAK.

\Vitnesses H. A. KORNEMANN, JOSEPH F. JAQUITH. 

